Play any game on PC and look at the gamepad's inputs. You'll notice that a ton of inputs are missing but the game's still completely playable on controllers. Those extra inputs were just that, extra, unnecessary, perfect for placing on a touchpad in case someone might wanna use them.
Since everyone else in this topic is being blunt with you, I'm also going to be blunt with you: this is a shit way to construct an argument. I've made some points that I feel are relevant to the topic, and your actual response to those points is "play any game on PC".
If you want to start convincing people,
you need to back up your own points. Telling me to play "any game on PC" is going to achieve the square root of fucking nothing, because amazingly I've
already played on PC in my lifetime and somehow that didn't make me like your idea any better, for reasons which I had already outlined to you.
The way to back up your argument would be to give specific examples - not just to repeatedly name-check ARMA 3, but to specify some exact control options in a PC game that are missing on the console version of that game, explain why those options couldn't be mapped on a standard controller without a touchpad gesture, and further explain what specific touchpad gestures you would use to make those options available.
Until you do that, what you're suggesting here is using a poor control system to add "unnecessary" controls into games that are already "completely playable", and that's not a convincing position.